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Jon CanfieldTed and Jim - First, the Russell collection was not even donated (or found in the donated materials) until 1983. Larry found his first Doyle in 1980. So, I would believe that Larry knew of the Doyle before he ever could have even viewed the Russell collection even assuming the Russell collection was available for viewing immediately after its' donation.
Ted - I agree with you when you said that Larry could probably not have acquired the Russell Doyle had he known about it since it was donated and part of a collection. However, the more important issue is that Larry thought his example was unique until 1987, so I still find it unlikely he viewed the collection or knew about Russell's Doyle until at least after 1987.
Also, you specifically asked whether Larry had fore-kowledge of the Russell Doyle. I think the answer still almost a most definite no - he had no fore-knowledge. Again, since the Russell collection was not even donated until 1983, Larry could not have seen it before 1983 at the earliest. Larry found his first Doyle before 1983.